Thanks for the pointer. Setting tcp_ecn to 0 resolved the issue.

Just because Intel no longer supports these boxes doesn't mean I'll turf them. At least not until they stop working or a feature is needed they don't provide.

The setup is pretty much as recommended anyway.

Thanks for your help, guys.
Best regards,
Matthias

Intel no longer makes or supports print servers, so you'll need
to turn off ECN on the Linux box.  Edit /etc/sysctl.conf adding
   net.ipv4.tcp_ecn = 0
and run as root
   sysctl -p

Given Intel's lack of support, you might want to move the
printer to the Linux box and have it act as the print server
(most Linux distributions support lpd, NetWare, Windows and
AppleTalk print protocols).

It's also unwise to put printers in the same VLAN as PCs.
Better that printers have their own VLAN and that a machine
sit between the two VLANs that acts as the spool for all
the printers.  This gives a single way to manage and account
all print traffic.  This is worthwhile even in a small office
with a lot of trust (eg: then an Apple user can delete the
job I submitted from Linux).
--
SLUG - Sydney Linux User's Group - http://slug.org.au/
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